Ok here's an update...

Flashed to latest BIOS. Still same low fps however.
Disabled TLB fix in the BIOS. No change.
Installed the patch that overrides the built in Vista SP1 TLB fix... and low and behold I can now run 40+ fps on main, 20-25 on clones no problem in windowed mode. Full screen is even better of course.

Unfortunately now I have to run this program after booting up to disable the fix every time. Since Microsoft was so kind to automatically enable the fix despite being turned off in the BIOS...

Conclusion: Piece of !@# AMD